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did anybody hear the vacuum leak at idle or was I just imagining things? Regardless of what it is, take a weekend and pull it, check it, fix it before it becomes expensive.
Try a long screw driver to the ear trick (cheap stethoscope) try checking plugs, check the rockers, you could even do a compression check, and take a vacuum reading before pulling. So much to do without spending a dime. Trust me, I'm about as cheap as they come.

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Check page 3 for the pics of my piston... it was all jacked up and causing the noise.